Commit 19a5a771 authored by Xuan Zhuo's avatar Xuan Zhuo Committed by Jakub Kicinski
Browse files

virtio_net: xsk: support wakeup 



xsk wakeup is used to trigger the logic for xsk xmit by xsk framework or
user.

Virtio-net does not support to actively generate an interruption, so it
tries to trigger tx NAPI on the local cpu.

Signed-off-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Link: https://patch.msgid.link/20240708112537.96291-8-xuanzhuo@linux.alibaba.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 09d2b318

drivers/net/virtio_net.c

+24 −0
Original line number Diff line number Diff line
@@ -1054,6 +1054,29 @@ static void check_sq_full_and_disable(struct virtnet_info *vi, 
	}

}



static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag)

{

	struct virtnet_info *vi = netdev_priv(dev);

	struct send_queue *sq;



	if (!netif_running(dev))

		return -ENETDOWN;



	if (qid >= vi->curr_queue_pairs)

		return -EINVAL;



	sq = &vi->sq[qid];



	if (napi_if_scheduled_mark_missed(&sq->napi))

		return 0;



	local_bh_disable();

	virtqueue_napi_schedule(&sq->napi, sq->vq);

	local_bh_enable();



	return 0;

}



static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,

				   struct send_queue *sq,

				   struct xdp_frame *xdpf)
@@ -5399,6 +5422,7 @@ static const struct net_device_ops virtnet_netdev = { 
	.ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,

	.ndo_bpf		= virtnet_xdp,

	.ndo_xdp_xmit		= virtnet_xdp_xmit,

	.ndo_xsk_wakeup         = virtnet_xsk_wakeup,

	.ndo_features_check	= passthru_features_check,

	.ndo_get_phys_port_name	= virtnet_get_phys_port_name,

	.ndo_set_features	= virtnet_set_features,